数字农科院2.0

Effect of calcium and phosphorus on ammonium and nitrate nitrogen adsorption onto iron (hydr)oxides surfaces: CD-MUSIC model and DFT computation

文献类型： 外文期刊

作者： Mengke Jia;Jie Ma;Qiongqiong Zhou;Lijie Liu;Xiaolei Jie;Hongen Liu;Shiyu Qin;Chang Li;Fuqing Sui;Haichao Fu;Haijiao Xie;Long Wang;Peng Zhao

作者机构：

关键词： Ammonium nitrogen;CD-MUSIC model;DFT calculation;Iron (hydr)oxides;Nitrate nitrogen

期刊名称： Chemosphere

ISSN： 0045-6535

年卷期： 2024 年 357 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Calcium (Ca2+) and phosphorous (PO43−) significantly influence the form and effectiveness of nitrogen (N), however, the precise mechanisms governing the adsorption of ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3−-N) are still lacking. This study employed batch adsorption experiments, charge distribution and multi-site complexation (CD-MUSIC) models and density functional theory (DFT) calculations to elucidate the mechanism by which Ca2+ and PO43− affect the adsorption of NH4+-N and NO3−-N on the goethite (GT) surface. The results showed that the adsorption of NH4+-N on the GT exhibited an initial increase followed by a decrease as pH increased, peaking at a pH of 8.5. Conversely, the adsorption of NO3−-N decreased with rising pH. According to the CD-MUSIC model, Ca2+ minimally affected the NH4+-N adsorption on the GT but enhanced NO3−-N adsorption via electrostatic interaction, promoting the adsorption of ≡FeOH-NO3− and ≡Fe3O-NO3− species. Similarly, PO43− inhibited the adsorption of ≡FeOH-NO3− and ≡Fe3O-NO3− species. However, PO43− boosted NH4+-N adsorption by facilitating the formation of ≡Fe3O-NH4+ via electrostatic interaction and site competition. DFT calculations indicates that although bidentate phosphate (BP) was beneficial to stabilize NH4+-N than monodentate phosphate (SP), SP-NH4+ was the main adsorption configuration at pH 5.5–9.5 owing the prevalence of SP on the GT surface under site competition of NH4+-N. The results of CD-MUSIC model and DFT calculation were verified mutually, and provide novel insights into the mechanisms underlying N fixation and migration in soil.

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